The projects, which will be constructed in Virginia, are anticipated to go online by 2020.
Dominion will secure support from Virginia-based companies in the development of projects, which are expected to produce enough energy for 100,000 homes.
The company is evaluating possible construction sites across Virginia. The slope and terrain of land, as well as other electrical and environmental factors are being assessed.
Dominion said the most cost-effective way to deploy solar is via large-scale projects as solar costs continue to fall.
Dominion Resources chairman, president and chief executive officer Thomas Farrell II said: "Our commitment to solar energy is an important part of the immediate future of our state.
"We appreciate the governor’s efforts to promote renewable energy in our Commonwealth. Technology has evolved in such a way that we see a long-term benefit for our customers and will work to lead the way in solar generation."
Earlier in 2015, Dominion submitted an application to the Virginia State Corporation Commission to build a 20MW solar project near its Remington Power Station in Fauquier County.
Remington facility and the 400MW projects are subject to approval from the State Corporation Commission.
Dominion has 744MW of solar generating capacity in development, under construction or in operation in seven states.
Image: Dominion plans to develop 400MW large-scale solar projects in Virginia. Photo: Courtesy of Naypong/FreeDigitalPhotos.net.
